Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b868f5176b03b42…

MALICIOUS

PDF

86.2 KB Created: 2021-09-03 05:53:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1aea61f05a4922667b0609a7c24bdcf1 SHA-1: bc22148193da33bdbfc2892644b8bb9a56839f46 SHA-256: 5b868f5176b03b42db67ca257c1e9e7bba4850eea2c5b4bf853be93e55b1f353
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and numerous links. The heuristics indicate a link farm strategy, with many links pointing to compromised WordPress sites and disposable hosting, likely to distribute malicious PDFs. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3092

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://wastran.ru/uplcv?utm_term=speer+reloading+manual+9mm PDF link annotation
    • http://obrienbuilders.com/userfiles/file/zisilikuwatidelubopete.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086bcf2dd650---15830379508.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/94660995848.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849531e2ebd---kibijepi.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/14896757906.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/kdesppnnpv5p8nfqc169spolmr/wijemajufimofem.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/33211735976.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e97c8ebbab7---41501526294.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210710191404.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/30058752864.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608574be3e0c1---40574744718.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/d5d60e8cbaee9d5478d4a408adf53f99/pagetisalovepaxedo.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1607d98371240b---sunijus.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d62d64649---kepodowewofutetum.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/kubuvema.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d4ddb400f---19545316965.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e30d3a300---68379542847.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b642b7fc6a---46516136234.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a41996141db---27554036729.pdfIn PDF document text
    • http://kfbi.ru/content/file/9027217141.pdfIn PDF document text
    • http://ambulatorioveterinariocigliano.com/userfiles/files/53562589561.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/ef8ed4fa3214582d0ff342b42b83619e/76674390736.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/46ab6d223d54b309317b117537cd97f4/bitido.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/nemamopupuxanozobezaziwe.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/rutewilarujig.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f6151a11f2f---weripexusasikebuwewijiduj.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/xoxekuxowo.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000112af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012ac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC1 19324 bytes
SHA-256: 655898c9eb741fdb7780e1aac4a0c0bcd94a50b541f0c9933a5e62b5bbe356eb

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